Manual weigh batching, a feature of a lot of plants that batch-blend bulk products, entails the person weighing of ingredients prior to they are charged into a blender or other process vessel. An automated weigh batching system, providing a more-accurate and consistent mixture, may very well be a viable option. Get additional info about дозатор сыпучих материалов
In quite a few plants that use manual methods, it can be typical practice to work with pre-weighed bags. You will find problems related with this method, such as each bag may not include the specified volume of material or the worker might not empty the bag absolutely. Inaccuracies are compounded as far more bags are used. In addition, if an operator is necessary to count bags in order to accomplish proper weight, there might be an increased threat of human error.
There are actually two automated weigh batching techniques: gain-in-weight and loss-of-weight. Within the initial arrangement, batch components are usually conveyed in sequence into a hopper positioned above a process vessel, generally a blender or storage vessel. The hopper is set on load cells that transmit weight-gain data to a programmable logic controller (PLC) that begins the conveyor for each and every ingredient, after which stops it when the preset weight for that ingredient is reached. Finally, the controller automatically charges the batch for the process vessel.
When to specify a gain-in-weight versus a loss-of-weight system
The most appropriate weigh batching method for the plant will rely on how and exactly where bulk material is received and stored. When the material is delivered in rail automobiles or bulk trucks and stored in silos, that are impractical to mount on load cells needed to get a loss-of-weight system, a gain-in-weight system is acceptable. Conversely, if material is received in bulk bags, a loss-of-weight system integrating bulk bag unloaders mounted on load cells may be the solution for you.
Integrating a weigh batching system into an current process
An automated weigh batching system is normally integrated with the plant's bulk handling system, and generally incorporates pneumatic and/or mechanical conveyors. All upstream and downstream equipment, from receiving to processing or packaging, might be sealed to remove contamination of your product and plant environment.
The whole operation may be automatically controlled. One option is to use a scale interface card to link up with an existing plant-wide PLC system; a second should be to use a stand-alone PLC, in addition to a third is always to employ a sequential batch controller. The latter is usually a programmable device that can run all the equipment linked using the weigh batching system and retailer the product recipes. It can operate in stand-alone mode or be integrated to varying degrees together with the plant PLC.
A weigh batching system ought to be engineered according to the number, volume, flowability and place of supplies to be weighed, the respective strengths of loss-of-weight and gain-in-weight batching solutions, along with the new or existing conveyors, control systems and processes with which it will likely be integrated. The availability of a lot of weigh batching elements and lots of ways in which they could be configured, enable the plant engineer to design a system that functions reliably, improves product high-quality and boosts output though cutting cost.
